mtd: plat_nand: fix section error

With CONFIG_HOTPLUG=n, the following eror occurred during link:
local symbol 0: discarded in section `.devexit.text' from
drivers/built-in.o

It was caused by improper section reference. The __devexit_p()
should be added to the .remove function.
Signed-off-by: NThomas Chou <thomas@wytron.com.tw>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/nand/plat_nand.c

@@ -128,7 +128,7 @@ static int __devexit plat_nand_remove(struct platform_device *pdev)
 
 static struct platform_driver plat_nand_driver = {
 	.probe		= plat_nand_probe,
-	.remove		= plat_nand_remove,
+	.remove		= __devexit_p(plat_nand_remove),
 	.driver		= {
 		.name	= "gen_nand",
 		.owner	= THIS_MODULE,